Elasticity over -and -under type platform truck

The utility model discloses an elasticity over -and -under type platform truck, including chassis, external fixation board and internal fixation board, the chassis upper end is equipped with the internal fixation board, the internal fixation board outside is equipped with the external fixation board, be equipped with the clearance about the internal fixation board and between the external fixation board, be equipped with a sliding block and no. Two sliding blocks in the clearance of the internal fixation board left and right sides respectively, a sliding block and no. Two sliding block left and right sides all are equipped with the movable pulley, a sliding block and no. Two sliding block upper ends all are equipped with the flush ring, be equipped with the stay cord between two flush rings, the fixed pulley that is located internal fixation board top is walked around to the stay cord, a sliding block is laid eggs and is equipped with the flush ring of the equidistant setting of a plurality of, the gap bottom